I have Coonhounds, and have hunted for several years.
Based on my own limited experience I have found that about 6 months to a year old is the best time to start training. If you put too much on them at too young of an age often times you will bore them.
At the age of your pup, its time for socialization, and soon it will be time for leash training.
Good luck with your pup.
I have one Coonhound, thats a Duel Champion, he is a Grand Nite, and Grand Show Champion. He is the best Coonhound I have ever hunted, and the kids get him out and play with him. My Daughtor even likes to paint his townails.
After Deer Season, its on, my favorite time of year.